OKS 511 is an air-drying bonded coating based on molybdenum disulfide (MoS₂), forming a grey-black dry film. It is designed for dry lubrication of machine elements during temporary operation, intermittent motion, or after long standstill periods. It can be used alone or together with oil/grease as a run-in lubrication layer.
1. Advantages & Benefits
- Highly effective due to good adhesion to prepared substrates
- Allows a low coefficient of sliding friction even under heavy loading
- Increased wear protection, reduces stick-slip and scoring
- Radiation- and vacuum-resistant, suitable for special working conditions
- Shortens and improves run-in of friction bearings, toothings and other sliding pairs
- Fast-drying film, no oil migration; suitable for dusty or clean environments
2. Applications
- Run-in lubrication in combination with oil or grease
- Dry lubrication of sliding pairs under heavy load, low speed, oscillating or intermittent motion
- High-temperature dry lubrication (up to 450°C, short sliding paths, low speeds)
- Dry lubrication in dusty environments to avoid adhesion
- Anti-stick / anti-wear coating for punching tools and dies
Industries: Iron & steel, rubber & plastics processing, chemical, logistics, paper & packaging, rail vehicle technology, glass & foundry, plant and machine (tool) engineering, municipal services, shipbuilding & marine technology.
3. Technical Data
|
Item
|
Standard
|
Conditions
|
Unit
|
Value
|
|
Main components
|
|
Binder
|
—
|
—
|
—
|
Silicone resin
|
|
Solvent
|
—
|
—
|
—
|
Butyl acetate
|
|
Solvent
|
—
|
—
|
—
|
Benzine
|
|
Solid lubricants
|
—
|
—
|
—
|
Graphite
|
|
Solid lubricants
|
—
|
—
|
—
|
MoS₂
|
|
Application related technical data
|
|
Flash point
|
DIN 51 755(-2)
|
<65(<5°C)
|
°C
|
-30
|
|
Lower operating temperature
|
—
|
—
|
°C
|
-180
|
|
Upper operating temperature
|
—
|
—
|
°C
|
450
|
|
Optimal layer thickness
|
DIN 50 981/50 984
|
DIN 50 982-2
|
μm
|
10–15
|
|
Surface covering
|
—
|
—
|
m²/kg
|
10–50
|
|
Processing temperature
|
—
|
—
|
°C
|
20–25
|
|
Drying time
|
—
|
—
|
min
|
30
|
|
Colour
|
—
|
—
|
—
|
Grey-black
|
|
Density (at 20°C)
|
DIN EN ISO 3838
|
—
|
g/cm³
|
0.7
|
|
Press-fit test (μ)
|
draft DIN 51 833
|
—
|
—
|
0.07, no chatter
|
Packaging: 400 ml Spray
4. Application Notes
- Mechanically clean the surface, then degrease with OKS 2610 / 2611 universal cleaner.
- Surface must be bright metal, dry; a roughness of 5–10 μm is favorable.
- Chemical or mechanical pretreatment extends service life.
- Shake well before use, apply a thin even coat, avoid excess and runs.
- Air-dry approx. 30 min at 20–25°C.
6. FAQ
Q1: Can OKS 511 replace grease?
Yes, it can replace grease in dry, high-temperature, dusty or long standstill conditions. For continuous high-speed operation, it is recommended to combine with an oil/grease lubrication system.
Q2: Can it be used on plastic or rubber parts?
The TDS primarily targets prepared metal substrates. For non-metallic materials, adhesion and compatibility tests must be conducted beforehand.
Q3: Is a thicker coating better?
No. The optimal layer thickness is 10–15 μm. Excessive thickness causes cracking, powdering and poor adhesion.
Q4: Why can the friction coefficient be as low as 0.07?
The lamellar structure of MoS₂ and graphite forms a low-shear transfer film under heavy pressure, enabling an extremely low coefficient of friction.
Q5: What are the safety and storage precautions?
Contains flammable solvents and aerosol propellant. Keep away from ignition sources and direct sunlight. Storage temperature must not exceed 50°C.
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